Παραπομπή APA
Heyel, C. (1972). Handbook of modern office management and administrative services. New York: McGraw-Hill.
Παραπομπή Chicago StyleHeyel, Carl. Handbook of Modern Office Management and Administrative Services. New York: McGraw-Hill, 1972.
Παραπομπή MLAHeyel, Carl. Handbook of Modern Office Management and Administrative Services. New York: McGraw-Hill, 1972.
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